Internal combustion engine



NM! T5 1931. Q BAUR 132J58 INTERNAL COMBUSTION'ENGINE- Filed Oct. 19,1928 2 Sheets-Sheet 2 Patented Nov. 17, 1931 UNITED T E S OTTMAR BAUR OISTUTTGAR'I, GERMANY, ASSIGNOR T AGRO' AKTIENGESELLSGEAFT, OFKUSSNACHT-ON-THE- RIGI, SWITZERLAND INTERNAL COMBUSTION ENGINEApplication filed October 19, 1928, Serial No. 313,512, and. in GermanyOctober 31, 1927.

The present invention relates to internal combustionengineshavingself-ignition and of the type in which the cylinder chamber is connectedthrough a throttling aperture with a chamber which is provided with afrustroconical space, into which the injection of the fuel towards thethrottling, member com.- mences at the end of the compression stroke.

In the known engines of this type, the jet injects the stream of fuelinto the funnelshaped member axially of its mounting and is thereforearranged substantially coaxially with the funnel and the chamber locatedbehind the latter. This construction can. however, only be carried outwith difliculty in many .cases, since the introduction of the jet orchamber is often very objectionable and cumbersome so that either thespace available for the inlet and outlet ducts and valves together withtheir control members, startingmeans, measuring and lndlcatmg pipes, is

considerably limited, or the conditions of flow are very unfavorable. Inmany cases, these difiiculties can beovercome if, according to theinvention, precautions are taken to ensure the injected stream emergingin known manner at right angles, or substantially at right an oles. tothe axis of the jet and being directed directly into the funnel and atEast substantially towards the throttle mem- Four-forms of constructionof the object of the invention are shown in the drawings.

Figure 1 is a longitudinal section through a cylinder and piston of thefirst form of construction in which the jet holder and jet are mountedin the ton edge of the cylinder casino and the funnel and chamber arearranged at an angle on the edge of the cylinder head.

Figure 2 is a similar view of the second term of construction whichdiffers from the first niainlv in the arrangement of the jet holder andjet.

Figure 3 is a longitudinal section and Figure 4 a side elevation of thethird form of construction. The jet holder and jet are insertedtangentially into the cylinder casing and the axis of the chamber isparallel to that of the cylinder.

In the fourth form of construction shown in Figure 5, both the jetholder and the jet and also the funnel and chamber are arranged in thecylinder head.

The cylinder is indicated in all forms of construction by a, thecylinder head-by b and the piston, which is shown in its inner deadcentre position, by a. The reference letter (1 relates to the holder forthe injection nozzle and jet and e to the orifice of the jet.

In the first form of construction, shown in Figure 1, the jet holder allprojects at right angles through the cylinder wall into the path of thepiston c in close proximity to the upper edge of the cylinder. Theorifice e of the jet is arranged so that the stream of fuel is directedsubstantially at right angles to the axis of the jet holder into afrustro-conical chamber of a funnel shaped member 9 arranged in thecylinder head b in the proximity of the orifice e of the jet and topedge of the cylinder a.

'The throat or narrowest portion h of the funnel-shaped member 9 forms anarrow duct connecting. the cylinder chamber of the engine with achamber 2'.

The mouth or widest cross-section of the funnel merees directly into thecylinder chamber without any communicating duct so that the flow cantake place without any obstruction.

The chamber 2' and funnel g are arranged so that the hot stream d rectedout of them on the working stroke is directed at an angle into thecylindrical chamber and is uniform-' ly distr buted, since itv does notstrike the walls of the cylindrical chamber at right.

angles, but glances off them.

A particular result obtained by the arrangement of the jet holder dandjet and the is, in the second case, protected behind a protectingwall is which, however, is arranged so that it does not prevent directinjection by the jet into the funnel g. The advantage is also obtainedover the first form of construction that the piston c and consequentlythe whole engine is lower, as the recess in the piston a can be omitted,and consequently the piston rings can be positioned nearer to the end ofthe piston.

In the third form of construction shown in Figures 3 and 4, the holder dand jet are arranged tangentially in the. cvlinder a. Otherw se there isscarcely any difference between this form and those already described.

In the fourth form of construction shown in Figure 5, the axis of thejet holder at is arranged parallel to the axis of the cylinder a in thehead I) and the funnel g and the chamber 6 are arranged at the side inthe head. Further. an incandescent wire ignition plug m which iselectrically heated on starting projects into the funnel g. a

Instead of arranging the chamber in the cylinder as in the exampleshown, it can also be provided in the piston.

It has also been pointed out and can also be clearly seen from-thevarious figures that a simple compact, construction can be obtained bythe improved assembly of the individual known elements. Further, danerous spaces in the cylinder a can be avoided by the improvedconstruction so that'the requirement which is often met with in enginesof this type of obtaining as much air as possible in the chamber on thecompression stroke is easily fulfilled.

I declare that what I claim is 1. In an internal combustion engine, acylinder head, an engine cylinder, the walls of which are longitudinallyrecessed at one .point adjacent that end connected to said cylinderhead, a funnel shaped member in said cylinder head forming afrustro-conical chamber merging directly into said longitudinal recessand into the chamber of said engine cylinder, and a fuel jet holderextending at right angles to the axis of said cylinder and mounted insaid cylinder walls, the fuelbeing projected from said jet holder atright angles to the axis thereof and through said longitudinal recess ofsaid cylinder walls into sai frustro-conical chamber.

2. In an'internal combustion engine, an engine cyhn'der, a cylinderhead, a. funnel fixed my signature.

OTTMAR BAUR.

